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Extrusion deformation aluminum-lithium alloy with high Zn content and high strength and toughness, and preparation method thereof

A technology of extrusion deformation and aluminum-lithium alloy, which is applied in the field of metal materials and metallurgy, can solve problems such as deterioration of alloy plasticity, and achieve the effect of improving corrosion resistance, good corrosion resistance, and low cost

Active Publication Date: 2018-07-27
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on adding a higher content of Zn to aluminum-lithium alloys. The main reason is that adding too much Zn may precipitate coarse Zn-containing phases between the grains of aluminum-lithium alloys and deteriorate the plasticity of the alloys.

Method used

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  • Extrusion deformation aluminum-lithium alloy with high Zn content and high strength and toughness, and preparation method thereof
  • Extrusion deformation aluminum-lithium alloy with high Zn content and high strength and toughness, and preparation method thereof
  • Extrusion deformation aluminum-lithium alloy with high Zn content and high strength and toughness, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Preheat the Al-Cu master alloy, Al-Zr master alloy, pure lithium, pure zinc, pure magnesium and pure aluminum to 180°C-200°C. Pure aluminum is then melted in a graphite crucible. After the pure aluminum is melted, Al-Cu master alloy, Al-Zr master alloy, pure magnesium and pure zinc are sequentially added in the temperature range of 740°C-780°C. Sprinkle a covering agent on the surface of the molten metal, add pure lithium under the protection of argon, and then remove slag and refine. Then stir evenly, remove the slag and sprinkle it into the covering agent. When the temperature of the melt drops to about 730°C, add C 2 Cl 6 The refining agent refines the melt and removes slag. After standing still for 4 minutes, under the protection of argon, the melt was continuously cast to obtain an ingot. The homogenization process of the ingot is: heat preservation at 460°C for 12h, then heat preservation at 510-520°C for 10h, and finally heat preservation at 540-550°C for 2h ...

Embodiment 2

[0048] Preheat the Al-Cu master alloy, Al-Zr master alloy, pure lithium, pure zinc, pure magnesium and pure aluminum to 180°C-200°C. Pure aluminum is then melted in a graphite crucible. After the pure aluminum is melted, Al-Cu master alloy, Al-Zr master alloy, pure magnesium and pure zinc are sequentially added in the temperature range of 740°C-780°C. Sprinkle a covering agent on the surface of the molten metal, add pure lithium under the protection of argon, and then remove slag and refine. Then stir evenly, remove the slag and sprinkle it into the covering agent. When the temperature of the melt drops to about 730°C, add C 2 Cl 6 The refining agent refines the melt and removes slag. After standing still for 4 minutes, under the protection of argon, the melt was continuously cast to obtain an ingot. The homogenization process of the ingot is: heat preservation at 460°C for 12h, then heat preservation at 510-520°C for 10h, and finally heat preservation at 540-550°C for 2h....

Embodiment 3

[0055] Preheat the Al-Cu master alloy, Al-Zr master alloy, pure lithium, pure zinc, pure magnesium and pure aluminum to 180°C-200°C. Pure aluminum is then melted in a graphite crucible. After the pure aluminum is melted, Al-Cu master alloy, Al-Zr master alloy, pure magnesium and pure zinc are sequentially added in the temperature range of 740°C-780°C. Sprinkle a covering agent on the surface of the molten metal, add pure lithium under the protection of argon, and then remove slag and refine. Then stir evenly, remove the slag and sprinkle it into the covering agent. When the temperature of the melt drops to about 730°C, add C 2 Cl 6 The refining agent refines the melt and removes slag. After standing still for 4 minutes, under the protection of argon, the melt was continuously cast to obtain an ingot. The homogenization process of the ingot is: heat preservation at 460°C for 12h, then heat preservation at 510-520°C for 10h, and finally heat preservation at 540-550°C for 2h....

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Abstract

The invention relates to an extrusion deformation aluminum-lithium alloy with high Zn content and high strength and toughness, and a preparation method thereof. The alloy comprises, by weight, 4.1%-5.5% of Zn, 2%-4.5% of Cu, 2%-3% of Mg, 1%-2% of Li, 0.1%-0.5% of Zr, less than 0.25% of impurity elements in total, and the balance Al. Through melting and casing as well as extrusion deformation, theextrusion deformation aluminum-lithium alloy with high Zn content is prepared. Through deformation and aging treatment, not only lots of Tl(Al2CuLi) but also S' (Al2CuMg) phases and eta' (MgZn2) phases are precipitated from the alloy with high Zn content, and the strength and toughness of the alloy are improved effectively. The aluminum-lithium alloy prepared with the preparation method provided by the invention not only has excellent mechanical properties, but also is low in alloy cost, and has broad application prospects in the fields, such as aerospace, high-speed railways and robots.

Description

technical field [0001] The invention belongs to the field of metal materials and metallurgy. Specifically, it includes a deformed aluminum-lithium alloy with high Zn content, high strength and high toughness and its preparation method. Through heat treatment and composition optimization, a new type of high-strength and toughness aluminum-lithium alloy is developed. Background technique [0002] Aluminum-lithium alloys are a class of aluminum alloys with low density, high elastic modulus, and high strength. Studies have shown that 1% lithium by mass fraction can reduce the alloy density by 3% and increase the elastic modulus by 6%. Moreover, compared with composite materials, aluminum-lithium alloys also have obvious price advantages. Therefore, aluminum-lithium alloys are regarded as the most potential lightweight metal materials in the aerospace industry. China's latest domestically-made C919 large aircraft, which has successfully tested its flight, also uses a large amou...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22C21/18C22C21/16C22C1/03C22C1/06C22F1/053C22F1/057
CPCC22C1/026C22C1/03C22C1/06C22C21/10C22C21/16C22C21/18C22F1/053C22F1/057
Inventor 孙江伟张亮吴国华涂季冰刘文才
Owner SHANGHAI JIAO TONG UNIV
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